摘要
利用切削液流体Reynolds公式和其引起的钻杆弯曲变形、倾角方程,建立了深孔加工直线度误差方程,揭示了流体入口压力、钻杆转动、涡动、挤压与深孔直线度之间的关系。指出在切削稳定状态下,减小流体入口压力,增加钻杆转速、减小钻杆涡动速度或者减小钻杆挤压速度均可改善深孔直线度。设计了新型多级喷射装置,通过增设分流腔和喷射级数来降低入口压力,可有效减小深孔直线度误差。设计了挤压油膜阻尼器(squeeze film dampers,简称SFD),利用油膜阻尼力减小深孔钻杆的涡动与挤压运动,来提高深孔加工直线度。试验了多级喷射装置和SFD共同作用下的深孔直线度误差,验证了钻杆在较低流体入口压力、较小涡动和挤压作用下加工的深孔有更好的直线度,为控制深孔加工直线度误差给出新的思路及设计方案。
The equation for deep hole straightness error is established by using the cutting fluid Reynolds equation,bar bending deformation theory and drill bar angle equation,which reveals relationships between cutting fluid inlet pressure,drill rotation,whirl,squeezing feed and deep hole straightness.In the condition of cutting stability,deep hole straightness can be improved by reducing the cutting fluid inlet pressure,increasing the drill rotation speed or decreasing drill whirl speed and extrusion speed.A new type of multi-injection device is designed that can effectively reduce the deep hole straightness error through an additional shunt cavity and injection series to reduce the inlet pressure.Squeeze film dampers(SFD)are designed,and extruding whirl and extrusion of the deep hole drill pipe are decreased by using oil film resistance,which improves the deep hole straightness.Testing deep hole straightness error under the action of the multi-stage injection device and SFD,and drill in the lower cutting fluid inlet pressure and small whirl and extrusion have a better deep hole drilling straightness is verified.New ideas and a design scheme are given to control the deep hole processing straightness error.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2015年第3期553-558,596,共6页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51175482)
山西省研究生优秀创新资助项目(20133099)
中北大学研究生科技基金资助项目(20131007)
关键词
深孔
直线度误差
多级喷射装置
挤压油膜阻尼器
deep hole drilling
straightness error
multi-injection device
squeeze film dampers(SFD)
